Thank you for viewing! This listing is for a PIVOT PROGAUGE tachometer, 52mm, sold as junk! It was installed and working fine until a month ago, so I believe it should still work. The reason for being junk is that the tabs on the ring part of the meter body are broken. Please consider it as junk due to this! It should be fixable with hot glue or adhesive. There are no instructions or original box. No returns, no refunds, no exchanges (3N) please. If you have any questions, please feel free to comment!